Table 1. Notations used in the models.

(a) Processes
L I, J	Division rate of SCs
S I, J	Probability that the division is symmetric
P I, J	Probability that a symmetric division is a differentiation event
D I, J	Death rate of differentiated cells
(b) Controls
q x(q y)	Partial derivative of L I, J − D I, J with respect to the argument I (J), evaluated at the equilibrium.
p x(p y)	Partial derivative of P I, J with respect to the argument I (J), evaluated at the equilibrium.

(a) Definitions of rates and probabilities. Subscripts denote functional dependence on the cell populations I and J. (b) The four partial derivatives evaluated at the equilibrium comprise the four controls in a two-compartment system.